Alaska Satellite Facility - Distributed Active Archive Center


About InSAR

Differential interferometric synthetic aperture radar (InSAR) is used to measure displacements on Earth’s surface to a precision of a few centimeters or less. InSAR data are largely used to study deformation caused by earthquakes, volcanic eruptions, glacier movements, landslides, and subsidence. They may also be used to examine the distribution of water vapor in the atmosphere, among other applications.

Sentinel-1 InSAR (Beta) Products

Sentinel-1 Interferogram (BETA) products are prototype Level 2 NISAR-Format interferometric products produced using the ARIA Science Data System under development for the NASA-ISRO Synthetic Aperture Radar (NISAR) mission. The creation, discovery, and distribution of these products is to inform the NISAR mission team of possible cloud-based processing and data management solutions. As such, these prototype products are not part of the ASF long-term archive and may become unavailable at any time as new SAR interferometric processing and delivery methods are explored.

Legacy InSAR Services

Vertex Search and Order

ASF offers users the ability to search for a small set of legacy beta InSAR products via the Vertex interface (see coverage map). Through Vertex, users may search for SAR granules, view InSAR stacks, select InSAR pairs, and interact with the Baseline Plot tool.

Seamless SAR Access (SSARA) API

The SSARA API provides users with a single access point to search for InSAR pairs, corresponding 90-m SRTM Digital Elevation Model (DEM) data, and water-vapor models from the Online Services for Correcting Atmosphere in Radar (OSCAR) of NASA’s Jet Propulsion Laboratory (JPL). ASF collaborated with UNAVCOOpen Topography, and JPL to create and deliver the SSARA API.

InSAR Uses

ALOS PALSAR Reveals Volcanoes Sink After Large Earthquakes by Matt Pritchard, Summer 2013.

ALOS PALSAR Interferometric Synthetic Aperture Radar (InSAR) by Zhong Lu, Winter 2007.

Interferometric Synthetic Aperture Radar: Building Tomorrow’s Tools Today by Zhong Lu, Anniversary Edition, 2006.

Using InSAR to Study Earthquakes in South America by Matt Pritchard, Winter 2004.

Sentinel-1 Interferometry from the Cloud to the Scientist by Jessica Garron, AGU 2017.

InSAR – Collaboration

InSAR Access — API Among ASF’s many collaborations, University NAVSTAR Consortium (UNAVCO)/Western North American InSAR (WInSAR), the Alaska Satellite Facility (ASF), and the Jet Propulsion Laboratory (JPL) worked on an

InSAR – Coverage Maps of Sample Legacy InSAR Products

ASF has processed approximately 700 sample InSAR products and made them available for download via the SSARA API. The sample products cover portions of the following Geohazard Supersites: Hawaii, Los Angeles, and Marmara. The standardized products are each processed using ROI PAC and distributed in HDF5. User feedback is encouraged.

InSAR – Find Data

Seamless Synthetic Aperture Radar Archive API Search and Download Data from Multiple Archives The Seamless Synthetic Aperture Radar (SAR) Archive (SSARA) Application Programming Interface (API) enables users to search and

InSAR – Product Content Overview

This product guide introduces all parts of the ASF sample InSAR products. It includes details of the InSAR processing flow, the data layers stored in the HDF5 data container, the browse imagery, and the metadata.